A radioactive metal that does not occur naturally. Only a few atoms have ever been made.
| Density | Unknown |
| Melting Point | Unknown |
| Boiling Point | Unknown |
At present, it is only used in research.
In 1970, a team led by Albert Ghiorso at the Californian Lawrence Berkeley National Laboratory (LBNL) bombarded californium with oxygen and was successful in producing element 106, isotope 263. In 1974, a team led by Georgy Flerov and Yuri Oganessian at the Russian Joint Institute for Nuclear Research (JINR) bombarded lead with chromium and obtained isotopes 259 and 260.